Benchmark: immutable vs mutable, slice VS splice VS shift for fixed size arrays

Script Preparation code:

var count = 120000;
var list = new Array(count).fill(100);

Tests:

slice immutable
if (list.length > count - 1) { list=list.slice(0, count - 1) list.push(count + 1) } else { list = [...list, count + 1]; }
splice immutable
list = [...list, count + 1] if (list.length > count) { list.splice(0, list.length - count); }
shift-while immutable
list = [...list, count + 1] while (list.length > count) { list.shift(); }
slice mutable
list=list.slice(0, count) list.push(count + 1)
splice mutable
list.push(count + 1) if (list.length > count) { list.splice(0, list.length - count); }
shift-while mutable
list.push(count + 1) while (list.length > count) { list.shift(); }

Rendered benchmark preparation results:

Previous results

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Related benchmarks:

immutable vs mutable, slice VS splice VS shift for fixed size arrays (version: 0)